England's disastrous Ashes campaign plumbed new depths on a sorry Sunday at the Waca as David Warner flayed their flagging attack for his second century of the series and Mitchell Johnson put Stuart Broad on crutches.

"Yeah, it's a bad one, there's no hiding away from that," admitted Broad, referring to the day's play rather than his metatarsal injury, although the protective boot he was wearing seemed symbolic of the battering England had taken in Brisbane, Adelaide and now Perth.

Predictably, it was Warner who put the boot in against an England bowling attack missing Broad in Australia's second innings, cracking 112 from 140 balls as he continues to enjoy sweet revenge for the miserable time he endured in the summer, when he was dropped, suspended, mocked and generally humiliated after swinging a punch at Joe Root in Birmingham's Walkabout bar after a Champions Trophy defeat at Edgbaston.

He had given Root a snarling send-off when the Yorkshireman failed to overturn a caught-behind decision on Saturday and was involved in several more verbal exchanges with England players early in his innings which seemed only to inspire him. "The fact that he could give it back to a few of the England guys, it may drive him," conceded Chris Rogers, his opening partner in a stand of 157 in 44 overs. "England might have to do something different. But he's so annoying, you have to get into him."

Now it is England who have been humiliated. A team who arrived as warm favourites to win the urn for the fourth consecutive series, and were widely admired if occasionally mocked for the meticulous professionalism symbolised by the 82-page booklet of dietary requirements distributed to Australia's Test grounds, have been comprehensively outplayed by a rejuvenated and ferociously committed Australia team, and left facing a battle to avoid a repeat of the 5-0 drubbing endured by Andrew Flintoff's squad on the last Ashes tour but one.

Broad insisted they had come to the ground morning still confident in their ability to reduce the arrears to 2-1, firstly by extending their overnight total of 180 for four somewhere close to Australia's 385. Instead they were all out for 251, their highest first-innings total of the series but a tame surrender nonetheless, especially after an opening partnership of 85 between Alastair Cook and Michael Carberry on Saturday – and also suffered the collateral damage to Broad, who has been comfortably their best bowler in the series but was thrown into doubt for the remaining two Tests when he was struck on the top of his right foot, and trapped plumb lbw, by a rapid swinging yorker from Johnson.

"We came here this morning knowing that we had to get close to Australia and believing that we could," said Broad. "But losing those three wickets before the new ball was obviously very disappointing. Australia had the chance to blow the tail away. That started the day off pretty badly and then Australia didn't have a lot of pressure on them when they came to bat and played in the attacking way they have all summer."

Broad credited that attacking approach, which has been such a contrast with the tourists' conservative mindset, as a key factor behind the stunning turnaround since Australia were beaten 3-0 in England. "Australia have been fantastic," he said. "We played some brilliant cricket six months ago, we created a lot of pressure with the ball and got enough runs. This time around we've lost three big tosses but haven't been able to apply the pressure when we really needed to, and Australia have been attacking enough to take the game away from us."